Advertisements
Advertisements
प्रश्न
A balloon filled with helium gas floats in a big closed jar which is connected to an evacuating pump. What will be your observation, if air from the jar is pumped out? Explain your answer.
Advertisements
उत्तर
Observation : The balloon will sink.
Explanation : As air is pumped out from jar, the density of air in jar decreases, so the upthrust on balloon decreases. As weight of balloon exceeds the upthrust on it, it sinks.
APPEARS IN
संबंधित प्रश्न
What is meant by the term ‘buoyancy’ ?
The relative density of alcohol is 0.8. Its density is
What is the cause of buoyant force ?
The density of water is 1.0 g Cm-3. The density of iron is 7.8 × 10″3 g Cm-3. The density of mercury is 13.6 g Cm-3.
Ans the following:
Will a piece of iron float or sink in water?
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
Figure shows the same block of wood floating in three different liquids A, B and C of densities ρ1, ρ2 and ρ3 respectively. Which of the liquid has the highest density? Give a reason for your answer.
What is the centre of buoyancy? State its position for a floating body with respect to the centre of gravity of the body.
How is thrust different from pressure?
Icebergs and ships stay afloat due to ______.
